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EP0358649A1 - Agencement de filtrage de signaux de reception a modulation de frequence. - Google Patents

Agencement de filtrage de signaux de reception a modulation de frequence.

Info

Publication number
EP0358649A1
EP0358649A1 EP88903180A EP88903180A EP0358649A1 EP 0358649 A1 EP0358649 A1 EP 0358649A1 EP 88903180 A EP88903180 A EP 88903180A EP 88903180 A EP88903180 A EP 88903180A EP 0358649 A1 EP0358649 A1 EP 0358649A1
Authority
EP
European Patent Office
Prior art keywords
filter
signal
stage
stages
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88903180A
Other languages
German (de)
English (en)
Other versions
EP0358649B1 (fr
Inventor
Jens Hansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HuC Elektronik GmbH
Original Assignee
HuC Elektronik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25854670&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0358649(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by HuC Elektronik GmbH filed Critical HuC Elektronik GmbH
Publication of EP0358649A1 publication Critical patent/EP0358649A1/fr
Application granted granted Critical
Publication of EP0358649B1 publication Critical patent/EP0358649B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
    • H03D3/003—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback
    • H03D3/005—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback wherein the demodulated signal is used for controlling a bandpass filter

Definitions

  • the invention relates to an arrangement of the type specified in the preamble of claim 1 and to an FM receiver which is provided with such an arrangement.
  • Arrangements of this type are known from DE-OS 31 47 493 and 34 38 286, EP-Al-75 071 or FR-OS 81 21 986, all of which go back to the inventor.
  • a broadband IF filter is provided.
  • the center frequency f IF of such a broadband IF filter is 10.7 MHz for most standards, while the channel bandwidth is about 200 kHz ( ⁇ 100 kHz symmetrical to the center frequency fgF).
  • the transmission curve is chosen so that its bandwidth corresponds approximately to the transmission bandwidth.
  • this narrowband IF filter is readjusted depending on the modulation of the received signal. At any point in time, it is selected exactly where the current IF is currently located. This results in a significantly improved suppression of interference and noise components.
  • the bandwidth of this controlled IF filter which is also referred to in the literature as an "in-channel select” filter or abbreviated "ICS" filter, is approximately 20 kHz, which, however, means that only the monophonic useful signal component (L + R component of the MPX useful signal) is let through.
  • the object of the invention is to achieve, in a filter arrangement of the type mentioned at the outset, filtering the entire signal with sufficient sensitivity and immunity to interference without significantly increased structural complexity.
  • the advantages of the invention are not only an improvement in the transmission behavior for FM stereo signals. It has been shown that many improvements in the properties of the ICS method can generally be gained by the course of the transmission characteristics found. By adapting the transmission curve as a function of the signal conditions, a significant improvement in the reception conditions under critical conditions is achieved.
  • an FM stereo receiver equipped with the filter arrangement according to the invention with its features in an advantageous further development and a circuit for adjacent channel detection are also specified.
  • the invention is based on the knowledge that the improvement associated with the ICS method can be used in a particularly advantageous manner if, in critical reception situations, a switch is made to a narrower band of the transmission behavior. Despite disturbances located close to the useful signal, these are switched off particularly effectively in that the trackable filters immediately follow the useful modulation. It is thus possible to effectively eliminate such interference signals which, by using the ICS method or a bandwidth switchover, could hardly have been reduced in their effects alone. It is only through the sum of the measures according to the invention that their effects are reduced to such an extent that they can only be perceived by measuring means.
  • the change in the transmission characteristics results in an adaptation to the current reception situation in such a way that the hearing quality is hardly adversely affected.
  • care is taken to ensure that there is no subjectively noticeable deterioration in reception, particularly in a mobile reception situation.
  • This success is particularly important because sudden, sudden, strong noises impair listening pleasure with regard to the entire performance, even if the vast majority of the transmitted passages are of excellent transmission quality.
  • a preferred embodiment of a circuit for the detection of adjacent channel interference forms an effective means of assessing the reception quality in order to change the pass behavior automatically as a function of the output signal of this circuit.
  • the pass-through curve becomes more narrow-band when adjacent channel disturbances are detected.
  • the transmission curve according to FIG. 1, which will be discussed in more detail below, relates to the transmission behavior of the FM stereo receiver according to the invention shown in FIG. 2 as an exemplary embodiment. This is shown without a pre- and mixing stage, so that a standard IF signal ZF-L with a frequency of 10.7 MHz is present as the input signal of the block circuit shown.
  • An essential component of the block circuit according to FIG. 2 is the IF filter arrangement 1 according to the invention, which has three filter stages 10, 20 and 30 arranged in series in a first, upper filter branch.
  • the filter stage 10 which determines the relatively flat curve section of the filter transmission curve according to FIG. 1 and via which the higher-frequency components of the MPX signal pass, has a bandwidth of ⁇ 57 kHz, that is about 100 kHz.
  • the filter 10 is not a single-circuit filter, as it corresponds to the solid course of the transmission behavior (also the other filters) in FIG. 3, but a two-pole bandpass filter.
  • the more even course of the transmission curve of this filter in this case is shown in FIG. 3 with F- [ _ Q , designated and shown in dashed lines.
  • the bandwidths of the filter stages 20 and 30 are dimensioned such that the bandwidth of the series connection of the filter stages 10, 20, 30 is approximately 20 kHz.
  • MPX Multi £ lex_
  • MPX Multi £ lex_
  • This narrow, steep-edged course is superimposed on the course of the transmission curve F 10 , which results in the course of the bottom curve drawn with a solid line in FIG.
  • this superposition takes place in that the output of the first filter stage 10 in a second filter branch of the filter arrangement 1 is fed to an adder stage 40, which is also connected to the output of the third filter stage 30.
  • the adder stage 40 is expediently a summing amplifier which amplifies the filtered IF signal to the required level which is required for the subsequent demodulation in the demodulator 50.
  • a filter passage characteristic implemented in this way can also be implemented in other ways, for example by means of digital filters, without rejecting the inventive concept.
  • the demodulated signal labeled "NF" at the output of the demodulator 50 is subjected to a level and, if necessary, phase correction by means of a correction stage 111 in order to measure the different level and phase profiles in the two filter branches, that is to say the two input signals of the adder stage 40 to balance.
  • the corrected LF signal which contains all components of the MPX signal, is fed to a stereo decoder 60 and an ARI / RDS stage 70.
  • the stereo decoder 60 generates the stereophonic left (L) and right (R) information from the L + R and LR components, which are supplied to the corresponding L and R channels.
  • the ARI / RDS stage sifts out the modulated 57 kHz subcarrier of the ARI and / or RDS signal in narrowband, demodulates and (in the case of RDS) decodes the ARI or RDS additional signal and evaluates these additional signals out.
  • An ARI additional signal is understood to mean auto radio information in the form of a traffic radio transmitter and area identifier which is modulated onto the 57 kHz subcarrier in amplitude modulation.
  • the RDS additional signal is understood to mean radio data system information which, in addition or independently of the ARI additional signal in the form of a digital signal in 2PSK modulation, is modulated onto the 57 kHz subcarrier in a quadrature template.
  • the RDS information contains a station identification, a program type identification and the same program as the set transmitter broadcasting alternative frequencies (cf. EBU Doc. Tech. 3244 of the European Broadcasting Union).
  • the LF signal before or after the correction is fed to the control stage 80, which, in a manner to be explained in more detail below, adjusts the filter stages 10, 20 and 30 as a function of the modulation to the current IF.
  • the filter curve designated 2F- ] _ Q + F2O + F 3O in FIG. 3 has a sharp filter reduction of at least 6 dB with a width of approx. 20 kHz in the area of the center frequency f IF which is adjusted to the current IF .
  • This sharp filter reduction results, as already mentioned, from the series connection of the filter stages 10, 20 and 30.
  • the pass limits of the overall curve ( F ⁇ o + F 20 + F 3 ⁇ ) / F 10 lie 9 er ⁇ about 57 kHz from the center of the channel, so that the 57 kHz subcarrier is effectively filtered in the MPX signal.
  • An electronic switch 90 is provided in the second filter branch of the filter arrangement 1 (FIG. 2), which is controlled by a stage 100 for the detection of adjacent channel disturbances.
  • stage 100 is fed by the output of the first filter stage and has a switching threshold above which de Schlater 90 a switching signal.
  • the mono / stereo switchover effected by the switch 90 may make it possible to dispense with the mono-stereo switchover in the stereo decoder 60 which is customary today.
  • the stage 100 shown in more detail in FIG. 5e consists of the series connection
  • the envelope signal demodulator 101 is supplied with the output signal of the first filter stage 10 illustrated in FIG. 5a, the amplitude of which is modulated by interference between the useful and neighboring channels. The stronger the adjacent channel carrier, the greater this amplitude modulation.
  • the demodulated interference signal (FIG. 5b) at the output of the envelope demodulator 101 is freed of low-frequency signal components, which originate from the useful modulation or higher-frequency interference components, by means of a high and / or low pass filter 102.
  • the envelope curve (FIG.
  • the switching signal brings about a slight reduction in the frequency components of the control voltages shown there, approximately above 6 kHz
  • the switching signal in the control stage 4 for the senmodulators 6, 7 a slight increase in the frequency components of the control voltage generated there above about 5 kHz.
  • phase angle mentioned can be understood as phase modulation of the IF signal
  • the inventor had previously had the idea (DE-OS 31 47 493) to filter the IF signal before filtering through filter stages 10, 20, 30 subject to opposite phase modulation.
  • a first control stage 2 in a first control stage 2 generates a readjusting first control signal for the filter stages 20 and 30 and in a second control stage 3 a second control signal for the first filter stage 10 acts as a phase modulator. Lation using these phase- the dashed lines in Fig.
  • phase modulators 6 and 7 are provided, which are controlled jointly by a third control stage 4.
  • the phase modulator 6 is arranged in front of a mixer stage 5, which converts the incoming standard IF signal ZF- j _ of 10.7 MHz into a second IF signal ZF 2 of, for example, 700 kHz.
  • a local oscillator 8, to which the third phase modulator 7 is connected, is used for this purpose.
  • the control signals of the control stages 2, 3 and 4 and the frequency responses of the phase modulators 8, 7 and 10 are coordinated with one another in such a way that the phase response of the LF signal shown in solid line in FIG. 4 occurs at the output of the demodulator 50 results, which remains in the tracking range even at higher LF frequencies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Filters And Equalizers (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

Dans un agencement de filtrage pour signaux de réception à modulation de fréquence, en particulier pour récepteurs mobiles, la fréquence moyenne d'un filtre F.I. à bande relativement étroite par rapport à la largeur de la bande du canal est rajustée en fonction de la modulation, la forme de la courbe passante du filtre F.I. rajusté étant modifiable.
EP88903180A 1987-04-15 1988-04-15 Agencement de filtrage de signaux de reception a modulation de frequence Revoked EP0358649B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE3712736 1987-04-15
DE3712736 1987-04-15
DE19873724604 DE3724604A1 (de) 1987-04-15 1987-07-24 Anordnung zum filtern eines fm-ukw-empfangssignals
DE3724604 1987-07-24
PCT/DE1988/000236 WO1988008223A1 (fr) 1987-04-15 1988-04-15 Agencement de filtrage de signaux de reception a modulation de frequence

Publications (2)

Publication Number Publication Date
EP0358649A1 true EP0358649A1 (fr) 1990-03-21
EP0358649B1 EP0358649B1 (fr) 1994-12-14

Family

ID=25854670

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88903180A Revoked EP0358649B1 (fr) 1987-04-15 1988-04-15 Agencement de filtrage de signaux de reception a modulation de frequence
EP88903179A Revoked EP0357632B1 (fr) 1987-04-15 1988-04-15 Agencement de filtrage de signaux de reception a modulation de frequence ou a ondes metriques

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88903179A Revoked EP0357632B1 (fr) 1987-04-15 1988-04-15 Agencement de filtrage de signaux de reception a modulation de frequence ou a ondes metriques

Country Status (13)

Country Link
US (2) US5159709A (fr)
EP (2) EP0358649B1 (fr)
JP (2) JPH02503137A (fr)
KR (1) KR890700963A (fr)
CN (1) CN88102082A (fr)
AT (1) ATE115788T1 (fr)
AU (1) AU1579988A (fr)
BR (1) BR8807465A (fr)
DE (3) DE3724604A1 (fr)
IL (1) IL86055A (fr)
MY (1) MY103727A (fr)
PT (1) PT87253B (fr)
WO (2) WO1988008222A1 (fr)

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DE69303348T2 (de) * 1992-11-27 1996-10-24 Clarion Co Ltd RDS-Rundfunkempfänger
DE4324603A1 (de) * 1993-07-22 1995-01-26 Becker Gmbh IF-Filteranorndung in einem Empfänger für FM-Empfangssignale
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Also Published As

Publication number Publication date
DE3852486D1 (de) 1995-01-26
EP0357632A1 (fr) 1990-03-14
WO1988008223A1 (fr) 1988-10-20
PT87253B (pt) 1993-09-30
US5155862A (en) 1992-10-13
EP0357632B1 (fr) 1993-12-22
IL86055A0 (en) 1988-09-30
KR890700963A (ko) 1989-04-28
IL86055A (en) 1992-11-15
BR8807465A (pt) 1990-05-22
DE3724604A1 (de) 1988-12-01
CN88102082A (zh) 1988-12-21
AU1579988A (en) 1988-11-04
ATE115788T1 (de) 1994-12-15
EP0358649B1 (fr) 1994-12-14
DE3886531D1 (de) 1994-02-03
PT87253A (pt) 1989-05-12
WO1988008222A1 (fr) 1988-10-20
JPH02503137A (ja) 1990-09-27
US5159709A (en) 1992-10-27
MY103727A (en) 1993-09-30
JPH02503974A (ja) 1990-11-15

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